Boiler



M. DOERNER May 31, 1932.

BOILER Filed Sept. 22, 1928 MAX DOERNER MJJ/VW ATTORNEY Patented May 31, 1932 UNETE MAX DOEBNER, OF ASTORIA, NEW YORK BOILER,

Application filed September 22, 1928. Serial No. 307,617.

This invention relates to steam boilers and has for its principal object to provide a structure in which the steam can be produced in an extremely'short time. Another object is to provide a boiler of novel shape and having a large heating surface which is so disposed as to render a much greater value of the heat from the firebox available than heretofore.

A further object is to make those parts of the boiler which are subject to wear easily renewable, whereby the life of the boiler structure itself is greatly increased. Still further ob jects will become apparent as the nature of the invention is better understood after a perusal of the following specification.

The invention is illustrated bythe accompanying drawings, in which Fig. 1 is a vertical sectional view through a steam boiler of the'usual domestic type embodying my improvements;

Fig. 2 is a horizontal sectional View along the plane of line 22 in Fig.1; I

Figs. 3 and 4 are elevational views of modified forms of heating coils for the feed water.

Like characters of reference denote similar parts throughout the several views and the following specification.

In Figs. 1 and 2, 10 is an outer cylindrical shell of a boiler of the usual domestic type which is shown diagrammatically only. 11 is an ash pit, 12 are grate bars. 13 is a firebox, and 14 is an inner cylindrical shell, preferably concentric with shell 10, extending through the entire height of the boiler from above the firebox to the top of the boiler. defining between the two shells 10 and 14. and a top wall 15 and a bottom wall. 16, a chamber 17 for the generation of steam. 18 is a firing door.

and 19 is an ashpit door. 20 is a smoke pipe connection atop of the boiler shell 10. 21 is a gas passage formed by the inside of innershell 14 connecting the firebox 13 with the smoke pipe connection 20. p 22 is a pipe line leading to the feed water supply for the boiler. 23 is a coil composed of a plurality of vertical loops 24 extending throughout the entire length of the gas passage 21. A union 25 connects the inlet end 50 ofcoil 23 to the feed water pipe 22. and a union 26 its outlet end to another pipe 27 whichis brought down along the outside ofthe boiler to a regulating or shut-off valve 28. The outlet end of valve 28 is connected at 29 to a circularly bent-pipe 30 at the bottom of thechamber 17 Pipe 36 is closed at its end and provided with a number of small orifices 31.

The boiler is equipped with the usual safety appliances such as a water gauge 32, gauge cocks 33, pressure gauge 34, and a safety relief valve-35. 36 is a pipe connecting the steam space of the chamber 17 with the radi ators inthe house. I

In Fig; 3 a modified formof coil is shown consisting of a pipe 37 which is bent in cir- 'cular loops 38, its outlet being brought up again at 39. In the form of coil shown in Fig.4, a pipe 40 is bent into downwardly ex.

tending loops 41 and led back to the top by 7,

upwardly extending loops 42.

The operation of the device is, as follows Withithei construction shown in Figs. 1 and 2. water is admitted into the boiler through pip-e 22, coil 24, pipe 27, valve 28 and orifices 31 of ring 30 into the chamber 17. While passing through coil 24, the water is heated to a very high degree by the gases of combustion rising upwardly from the firebox 13 through gas passage 21. This heated water is then. discharged into chamber 17 where it is vaporized very quickly and thus transformed into steam. The efficiency of a boiler of this type is a particularly high one,

because the greatest possible amount of heat can be extracted from the gases of combustion while traveling through passage 21. This heat ordinarily would be wasted. Be-

cause the water admitted into the boiler is albe made much smaller than the steam space, and by automatic regulation of the feed water, in the manner well known in the art, a continuous supply of hot water can be injected into the chamber for the practically instant generation of steam. A greater steam space is provided for, because of the absence of tubes and other obstructions in chamber 17, commonly present in the older forms of boilers.

It is also understood that Various other changes in form, proportion of parts and minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of the invention as defined in the appended claim.

What I claim as new, is:

In a steam boiler comprising a structure having a firebox, a smoke pipe connection, and a passage for gases of combustion between the firebox and the smoke pipe connection, an annular chamber for water and the generation of steam around the said passage, a coil within the said passage, union connections atthe sides of the said smoke pipe connection and externally of the boiler, the inlet and the outlet of the said coil being each connected to one of the said union connec-- tions, the one union connection to which the said inlet is connected being connected to the feed water supply for the boiler, and a perforated pipe at the bottom of the chamber connected to the union at the said outlet of the said coil.

In testimony whereof I have hereunto set my hand.

MAX DOERNER. 

